“Absolutely, I want you to be my sister ─ that is if you wish,” Allen said and gave her another hug.

4 answers

1

Your sentence is basically okay (and Sanjay's advice was incorrect). But you definitely need a comma after that is, and I think a comma would also be a good idea after said, too. Or the final part of the sentence could be reworded this way: Allen said, before giving her another hug.